66475250687 has 2 divisors, whose sum is σ = 66475250688. Its totient is φ = 66475250686.

The previous prime is 66475250669. The next prime is 66475250701. The reversal of 66475250687 is 78605257466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66475250687 - 2¹⁴ = 66475234303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66475250987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33237625343 + 33237625344.

It is an arithmetic number, because the mean of its divisors is an integer number (33237625344).

Almost surely, 2^66475250687 is an apocalyptic number.

66475250687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66475250687 is an equidigital number, since it uses as much as digits as its factorization.

66475250687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 66475250687 in words is "sixty-six billion, four hundred seventy-five million, two hundred fifty thousand, six hundred eighty-seven".